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Landcover Inputs to Distribution Modelling

Landcover data consisted of a 2005 classified landcover map of North America developed by the Commission for Environmental Cooperation. We used 15 of the 19 landcover classifications (see below); the other four classes described dry and subtropical habitats not present in the study region. Landcover was mapped at a 250-m resolution, so there were or 256 land cover pixels per 4-km model cell.  For model-building purposes, we summarised landcover proportions according to the distribution of survey locations within the 4-km grid cell: the landcover type for each survey location within a cell was determined by the point-count center. For prediction,  we used the proportions of all landcover types within each cell.

 

Landcover classes (15) used in Maxent modelling

  • temperate or sub-polar needleleaf forest
  • sub-polar taiga needleleaf forest
  • temperate or sub-polar broadleaf deciduous forest
  • mixed forest
  • temperate or sub-polar shrubland
  • temperate or sub-polar grassland
  • sub-polar or polar shrubland-lichen-moss
  • sub-polar or polar grassland-lichen-moss
  • sub-polar or polar barren-lichen-moss
  • wetland
  • cropland
  • barren lands
  • urban
  • water
  • snow and ice
This page last updated: Sep 04 2012